US20200232879A1 - Receptacle device for receiving a drive axle of a motor vehicle for a test bench - Google Patents
Receptacle device for receiving a drive axle of a motor vehicle for a test bench Download PDFInfo
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- US20200232879A1 US20200232879A1 US16/634,499 US201816634499A US2020232879A1 US 20200232879 A1 US20200232879 A1 US 20200232879A1 US 201816634499 A US201816634499 A US 201816634499A US 2020232879 A1 US2020232879 A1 US 2020232879A1
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- test bench
- unit
- drive axle
- inner unit
- drive
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- 238000012360 testing method Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 5
- 230000001174 ascending effect Effects 0.000 claims description 4
- 239000000314 lubricant Substances 0.000 description 4
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 3
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000002966 varnish Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000010285 flame spraying Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/027—Test-benches with force-applying means, e.g. loading of drive shafts along several directions
Definitions
- the invention relates to a test bench for testing a drive axle for a motor vehicle having at least one drive device, at least one loading device and at least one receptacle device.
- the invention further relates to a method for testing a drive axle for a motor vehicle on a test bench.
- Drive axles of this type are used in particular in passenger vehicles and commercial vehicles.
- the drive axle is to be installed on a test bench for the purposes of carrying out a test, for example to determine wear or service life. Examinations on such a test bench are more cost-effective and more reliable, since the result depends to a lesser extent on external conditions. Furthermore, tests can be reproduced more easily on the test bench than during a test run in a vehicle.
- the test bench must be capable of realistically simulating different wheel loads and axle loads, for example. In addition to a static and dynamic loading of the axle, a suspension is also required for a realistic load distribution.
- the patent specification EP 0 293 425 B1 discloses a method for testing drive axles for motor vehicles, in which the drive axle, comprising axle housing, axle gear unit and at least one axle shaft, is clamped onto a test bench, driven on the drive side and braked on the output side, wherein during testing of the overall function of the axle, comprising drive and support function, the axle is loaded in the driven state by additional forces unrelated to driving and braking.
- the unexamined patent application DE 3 818 661 A1 discloses a test facility for testing complex drive systems, for example driven vehicle axles in which load spectrums generated by a computer are transferred by means of a device directly onto the wheel heads of such vehicle axles.
- the device comprises controllable actuators for generating horizontal and longitudinal forces as well as pairs of forces.
- the device is driven by means of an electric simulation drive.
- the controllable actuators and the electric simulation drive are linked to the computer via a control facility, so that any load spectrum can be generated.
- the unexamined patent application DE 10 2012 101 613 A1 discloses a test bench for motor vehicles or axles of motor vehicles for chassis development, on which gyroscopic torques of a rotating wheel can also be simulated.
- the test bench has a wheel substitute system, which is connected to at least one axle of the motor vehicle and comprises a wheel substitute mass and means for driving the wheel substitute mass.
- the test bench further has an arrangement for introducing test forces, torques and movements into the motor vehicle or the axles of the motor vehicle in the longitudinal, horizontal and/or height direction, wherein the means for driving the wheel substitute mass are suitable for causing the wheel substitute mass to rotate and the arrangement for introducing test forces, torques and movements is suitable for generating a gyroscopic torque of the wheel substitute mass which has been caused to rotate by introducing test forces, torques and movements into the motor vehicle or the axles of the motor vehicle in the longitudinal, horizontal and/or height direction.
- the unexamined patent application EP 1 837 538 A2 discloses a joint bearing having an inner ring and an outer ring, wherein the outer ring has a length and an outer circumference that define a first shoulder, which is arranged at one end along the length, and a second shoulder, which is arranged at a second end along the length, wherein the second end generally lies opposite the first end.
- the first and the second shoulder are dimensioned such that they press against a housing wall, wherein the housing wall defines a borehole in which the joint bearing is positioned.
- the unexamined patent application DE 10 2011 085611 A1 discloses a concept for sealing a bearing component for a bearing, which comprises a fastening option for fastening to a component to be supported, wherein the bearing component or the component to be supported has a recess for a seal, such that the bearing component can be connected at least in a watertight manner to the component to be supported.
- test bench for the dynamic testing of an individual chassis component or of a complete axle system of a motor vehicle.
- the test bench comprises a test bench frame.
- the test bench frame has a mounting area, which is provided for mounting the complete axle system in the mounting area in a first mounting direction.
- a fastening apparatus is provided for the secure mounting of the individual chassis components on the fastening apparatus in a second mounting direction, wherein the second mounting direction differs from the first mounting direction.
- the object underlying the invention is to provide a receptacle device for receiving a drive axle of a motor vehicle for a test bench, with which a more realistic load distribution can be achieved in comparison with the prior art.
- a test bench for testing a drive axle for a motor vehicle having at least one drive device, at least one loading device and at least one such receptacle device, wherein the receptacle device has at least one outer unit for connection to the test bench and at least one inner unit, enclosed at least in part by the outer unit, wherein the inner unit is translationally fixed relative to the outer unit and is designed to be flexibly rotatable about more than one axis, and wherein the inner unit has a recess suitable for receiving the drive axle.
- the object is further achieved according to the invention by a method for testing a drive axle for a motor vehicle on a test bench having at least one drive device, at least one loading device and at least one receptacle device, wherein the receptacle device has at least one outer unit for connection to the test bench and at least one inner unit, enclosed at least in part by the outer unit, wherein the inner unit is translationally fixed relative to the outer unit and is arranged to be flexibly rotatable about more than one axis, and wherein the drive axle is received by a recess of the inner unit.
- the object underlying the Invention Is to specify a receptacle device for a drive axle on a test bench, in which the drive axle is received as realistically as possible with regard to its loading and load distribution.
- the drive axle is received in a secure and stable manner by means of an inner unit, which is in particular affixed to the original suspension points.
- the drive axle is received in particular as in the vehicle.
- the inner unit is enclosed at least in part by an outer unit, wherein the inner unit with the drive axle is translationally fixed relative to the outer unit and is arranged to be flexibly rotatable about more than one axis so that the same degrees of freedom exist as in the vehicle, particularly with regard to an application of force and an application of torque.
- a realistic load distribution is achieved by the drive axle being received in this way.
- the inner unit has a partially spherical surface.
- the inner unit has an equatorially symmetrical, spherical segment-shaped surface.
- a spherical segment is a part of a full sphere that is cut out with two parallel planes.
- the area of both parallel circular sections is equal in size.
- the round region of the spherical segment forms a contact surface to the outer unit.
- the inner unit is three-dimensionally rotatable on account of such a partially spherical surface and is translationally fixed on account of the equatorially symmetrical embodiment.
- the outer unit has a contact surface corresponding to the partially spherical surface of the inner unit, at least in the region of a contact area.
- a corresponding contact surface is in particular a partially spherical recess, which corresponds substantially to the inverse of the partially spherical surface of the inner unit.
- the inner unit is enclosed in part by the outer unit, wherein the inner unit is translationally fixed and flexibly rotatable relative to the outer unit.
- the partially spherical surface of the inner unit and/or the corresponding contact surface of the outer unit are coated, in particular with a coating having molybdenum. At least one of the surfaces is carburized, subsequently manganese-phosphated and coated with a lubricant varnish based on molybdenum disulfide.
- a molybdenum coating is applied by means of flame spraying to at least one of the surfaces, wherein the molybdenum coating has a very good adhesion on account of its metallurgical properties.
- the coating thickness of the molybdenum coating lies between 0.1 mm and 2.0 mm. Such a coating optimizes the friction behavior between the inner unit and the outer unit.
- the inner unit is configured in at least two parts.
- the drive axle can be mounted easily and quickly.
- the loading device has wheel hub bearing means, via which a loading machine can be connected to the drive axle.
- the wheel hub bearing means comprise in particular at least one bearing unit, by way of which the drive axle is connected in a realistic manner to the loading device.
- the wheel hub bearing means comprise a bearing unit for absorbing an axial force.
- the bearing unit is affixed in particular in an axially flexible manner to a wheel hub. Such a bearing unit enables a loading of the drive axle free from axial forces.
- the loading device has at least one hydraulic cylinder for loading the drive axle with an in particular dynamic additional force.
- the dynamic additional force is generated by raising and lowering the hydraulic cylinder and acts in particular radially on the drive axle. Such a dynamic additional force acting radially on the drive axle enables ground unevennesses, for example, to be reproduced on the test bench.
- the loading device has push rods for transmitting an in particular dynamic additional force.
- the push rods make it possible to vary the force direction of the in particular dynamic additional force, thus enabling a realistic simulation of running characteristics and running situations.
- the test bench has a part-turn drive for simulating an ascending gradient and/or a descending gradient.
- a part-turn drive for simulating an ascending gradient and/or a descending gradient.
- the test bench has means for vibrationally isolating the test bench from a foundation.
- the result of the test of the drive axle is not distorted by external influences, for example by other test benches or other machines. Conversely, disturbances originating from the test bench are not transmitted to the foundation.
- the means for vibrationally isolating the test bench advantageously comprise spring elements.
- the use of spring elements enables the test bench to be isolated easily and cost-effectively from the foundation.
- FIG. 1 shows a three-dimensional representation of a test bench for a drive axle of a motor vehicle
- FIG. 2 shows a sectional view of a test bench for a drive axle of a motor vehicle in the region of a receptacle device
- FIG. 3 shows a three-dimensional section of a test bench for a drive axle of a motor vehicle in the region of a receptacle device
- FIG. 4 shows a three-dimensional representation of an inner unit of a receptacle device
- FIG. 5 shows a cross-section of the receptacle device with the drive axle.
- FIG. 1 shows a three-dimensional representation of a test bench 2 for a drive axle 4 of a motor vehicle, wherein the drive axle 4 is arranged for testing in a receptacle device 6 .
- the drive axle 4 is received by the receptacle device 6 on original suspension points in a translationally fixed and flexibly rotatable manner.
- the drive axle 4 thus has the same degrees of freedom in relation to an application of force and an application of torque as in the installed state in the vehicle.
- the drive axle 4 comprises an axle housing, an axle gear unit and at least one axle shaft.
- the test bench 2 comprises a drive device 8 , which has a drive motor 10 .
- the drive motor 10 is connected for example by way of a cardan shaft (not shown in FIG. 1 for reasons of clarity) to the axle gear unit of the drive axle 4 , which is embodied as a differential gear unit.
- the drive axle 4 is connected on both sides to a loading device 12 , wherein the loading device 12 has a loading machine 14 on both sides.
- the loading machines 14 are embodied for example as electric motors.
- the drive axle 4 can be loaded by the loading machines 14 both statically and dynamically, in particular in an oscillating manner, as well as differently on both sides.
- the drive axle 4 is driven on the drive side via the drive motor 10 of the drive device 8 and braked on the output side via the loading machines 14 of the loading device 12 .
- the loading device 12 has bearing units 16 arranged on both sides, which are mounted in an axially flexible manner on wheel hubs of the drive axle 4 . By absorbing axial forces, the bearing units 16 enable the loading of the drive axle 4 free from axial forces.
- test bench 2 is used to test the drive axle 4 , taking real wheel loads into consideration. To minimize external influences, the test bench 2 is vibrationally isolated from a foundation 22 . The vibrational isolation of the test bench 2 from the foundation is effected by means of spring elements 22 .
- FIG. 2 shows a sectional view of a test bench 2 for a drive axle 4 of a motor vehicle in the region of a receptacle device 6 .
- the received drive axle 4 is cooled by way of cooling pipes 25 with a coolant, for example air.
- the coolant which is guided onto the drive axle 4 by way of the cooling pipes 25 , for example via nozzles, simulates in particular a headwind.
- the receptacle device 6 of the drive axle 4 comprises on both sides of the axle drive unit in each case one outer unit 18 for connection to the test bench 2 and in each case one inner unit 20 enclosed in part by the outer unit 18 .
- the inner unit 20 has a partially spherical surface 26 , wherein the inner unit 20 rests on the outer unit 18 in the region of a bulge in the partially spherical surface 26 .
- the outer unit 18 has a contact surface 28 which corresponds to the partially spherical surface 26 of the inner unit 20 in the region of a contact area between the outer unit 18 and the inner unit 20 .
- the inner unit 20 is configured in two parts, wherein the drive axle 4 is connected at least in a form-fit manner to the inner unit 20 .
- the inner unit 20 is received in the outer unit 18 in a translationally fixed and flexibly rotatable manner. Furthermore, a part-turn drive 30 for simulating an ascending gradient and/or a descending gradient is affixed on each side of the receptacle device 6 of the test bench 2 .
- the drive axle 4 can be loaded in a driven state by dynamic additional forces unrelated to driving and braking, which simulate for example ground unevennesses.
- the additional forces comprise in particular tractive forces, which occur for example during braking and acceleration of a motor vehicle, and bending torques, which occur for example when a motor vehicle travels around curves or when the motor vehicle is in a laterally tilted position.
- the additional forces are generated hydraulically by way of hydraulic cylinders 32 , which are arranged below the bearing units 16 .
- the bearing units 16 are lubricated by means of automatic lubrication devices 33 , which press a lubricant, in particular grease, via nozzles into the bearing units as required. At least one part of the additional forces is transmitted via push rods 34 .
- the further configuration of the test bench 2 in FIG. 2 corresponds to the configuration shown in FIG. 1 .
- FIG. 3 shows a three-dimensional section of a test bench 2 for a drive axle 4 of a motor vehicle in the region of a receptacle device 6 .
- the configuration of the test bench 2 in FIG. 3 corresponds to the configuration shown in FIG. 2 .
- FIG. 4 shows a three-dimensional representation of an inner unit 20 of a receptacle device 6 .
- the inner unit 20 is manufactured from steel and has a partially spherical surface 26 .
- the partially spherical surface 26 of the inner unit has the shape of a spherical segment symmetrical to an equator 39 and is therefore referred to as an equatorially symmetrical spherical segment.
- the round region of the spherical segment symmetrical to the equator 39 is provided as the contact surface for the outer unit 18 and is carburized, subsequently manganese-phosphated and coated with a lubricant varnish based on molybdenum disulfide in order to optimize the friction behavior.
- the inner unit 20 is configured in two parts, wherein the first part 36 and the second part 38 are fixed together by means of connecting elements such as pins, screws or bolts, or alternatively connected to one another in a detachable manner. Furthermore, the inner unit 20 comprises a recess 40 for receiving the drive axle 4 , wherein the drive axle 4 is fastened by a connection of the parts 36 , 38 of the inner unit 20 .
- FIG. 5 shows a cross-section of the receptacle device 6 with the drive axle 4 , wherein the drive axle 4 is received via an adapter unit 42 in the recess 40 of the inner unit 20 shown in FIG. 4 .
- the adapter unit 42 is connected to the original suspension points of the drive axle 4 by way of connecting elements 44 , in particular screws or bolts.
- the inner unit 20 which is connected in a fixed manner to the drive axle, is received in the outer unit 18 in a translationally fixed and flexibly rotatable manner, wherein the coated, partially spherical surface 26 of the inner unit 20 is mounted movably on the corresponding contact surface 28 of the outer unit 18 .
- the corresponding contact surface 28 of the outer unit 18 is in particular also carburized, subsequently manganese-phosphated and coated with a lubricant varnish based on molybdenum disulfide in order to optimize the friction behavior.
- the further configuration of the receptacle device 6 corresponds to the configuration shown in FIG. 2 .
- the invention relates to a receptacle device 6 for receiving a drive axle 4 of a motor vehicle for a test bench 2 .
- the receptacle device 6 has at least one outer unit 18 for connection to the test bench 2 and at least one inner unit 18 enclosed at least in part by the outer unit 18 , wherein the inner unit 20 is translationally fixed relative to the outer unit 18 and is designed to be flexibly rotatable about at least one axis, and wherein the inner unit 20 has a recess 40 suitable for receiving the drive axle 4 .
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Abstract
Description
- The invention relates to a test bench for testing a drive axle for a motor vehicle having at least one drive device, at least one loading device and at least one receptacle device.
- The invention further relates to a method for testing a drive axle for a motor vehicle on a test bench.
- Drive axles of this type are used in particular in passenger vehicles and commercial vehicles. The drive axle is to be installed on a test bench for the purposes of carrying out a test, for example to determine wear or service life. Examinations on such a test bench are more cost-effective and more reliable, since the result depends to a lesser extent on external conditions. Furthermore, tests can be reproduced more easily on the test bench than during a test run in a vehicle. The test bench must be capable of realistically simulating different wheel loads and axle loads, for example. In addition to a static and dynamic loading of the axle, a suspension is also required for a realistic load distribution.
- The patent specification EP 0 293 425 B1 discloses a method for testing drive axles for motor vehicles, in which the drive axle, comprising axle housing, axle gear unit and at least one axle shaft, is clamped onto a test bench, driven on the drive side and braked on the output side, wherein during testing of the overall function of the axle, comprising drive and support function, the axle is loaded in the driven state by additional forces unrelated to driving and braking.
- The unexamined
patent application DE 3 818 661 A1 discloses a test facility for testing complex drive systems, for example driven vehicle axles in which load spectrums generated by a computer are transferred by means of a device directly onto the wheel heads of such vehicle axles. The device comprises controllable actuators for generating horizontal and longitudinal forces as well as pairs of forces. Furthermore, the device is driven by means of an electric simulation drive. The controllable actuators and the electric simulation drive are linked to the computer via a control facility, so that any load spectrum can be generated. - The unexamined patent application DE 10 2012 101 613 A1 discloses a test bench for motor vehicles or axles of motor vehicles for chassis development, on which gyroscopic torques of a rotating wheel can also be simulated. The test bench has a wheel substitute system, which is connected to at least one axle of the motor vehicle and comprises a wheel substitute mass and means for driving the wheel substitute mass. The test bench further has an arrangement for introducing test forces, torques and movements into the motor vehicle or the axles of the motor vehicle in the longitudinal, horizontal and/or height direction, wherein the means for driving the wheel substitute mass are suitable for causing the wheel substitute mass to rotate and the arrangement for introducing test forces, torques and movements is suitable for generating a gyroscopic torque of the wheel substitute mass which has been caused to rotate by introducing test forces, torques and movements into the motor vehicle or the axles of the motor vehicle in the longitudinal, horizontal and/or height direction.
- The unexamined patent application EP 1 837 538 A2 discloses a joint bearing having an inner ring and an outer ring, wherein the outer ring has a length and an outer circumference that define a first shoulder, which is arranged at one end along the length, and a second shoulder, which is arranged at a second end along the length, wherein the second end generally lies opposite the first end. The first and the second shoulder are dimensioned such that they press against a housing wall, wherein the housing wall defines a borehole in which the joint bearing is positioned.
- The unexamined
patent application DE 10 2011 085611 A1 discloses a concept for sealing a bearing component for a bearing, which comprises a fastening option for fastening to a component to be supported, wherein the bearing component or the component to be supported has a recess for a seal, such that the bearing component can be connected at least in a watertight manner to the component to be supported. - The unexamined patent application US 2013/055804 A1 discloses a test bench for the dynamic testing of an individual chassis component or of a complete axle system of a motor vehicle. The test bench comprises a test bench frame. The test bench frame has a mounting area, which is provided for mounting the complete axle system in the mounting area in a first mounting direction. A fastening apparatus is provided for the secure mounting of the individual chassis components on the fastening apparatus in a second mounting direction, wherein the second mounting direction differs from the first mounting direction.
- The object underlying the invention is to provide a receptacle device for receiving a drive axle of a motor vehicle for a test bench, with which a more realistic load distribution can be achieved in comparison with the prior art.
- This object is achieved according to the invention by a test bench for testing a drive axle for a motor vehicle having at least one drive device, at least one loading device and at least one such receptacle device, wherein the receptacle device has at least one outer unit for connection to the test bench and at least one inner unit, enclosed at least in part by the outer unit, wherein the inner unit is translationally fixed relative to the outer unit and is designed to be flexibly rotatable about more than one axis, and wherein the inner unit has a recess suitable for receiving the drive axle.
- The object is further achieved according to the invention by a method for testing a drive axle for a motor vehicle on a test bench having at least one drive device, at least one loading device and at least one receptacle device, wherein the receptacle device has at least one outer unit for connection to the test bench and at least one inner unit, enclosed at least in part by the outer unit, wherein the inner unit is translationally fixed relative to the outer unit and is arranged to be flexibly rotatable about more than one axis, and wherein the drive axle is received by a recess of the inner unit.
- The advantages and preferred embodiments cited below with respect to the receptacle device can be transferred analogously to the test bench and the test method.
- The object underlying the Invention Is to specify a receptacle device for a drive axle on a test bench, in which the drive axle is received as realistically as possible with regard to its loading and load distribution. In order to ensure that it is received realistically, the drive axle is received in a secure and stable manner by means of an inner unit, which is in particular affixed to the original suspension points. As a result, the drive axle is received in particular as in the vehicle. The inner unit is enclosed at least in part by an outer unit, wherein the inner unit with the drive axle is translationally fixed relative to the outer unit and is arranged to be flexibly rotatable about more than one axis so that the same degrees of freedom exist as in the vehicle, particularly with regard to an application of force and an application of torque. A realistic load distribution is achieved by the drive axle being received in this way.
- In a preferred embodiment, the inner unit has a partially spherical surface. In particular, the inner unit has an equatorially symmetrical, spherical segment-shaped surface. A spherical segment is a part of a full sphere that is cut out with two parallel planes. In an equatorially symmetrical spherical segment, the area of both parallel circular sections is equal in size. The round region of the spherical segment forms a contact surface to the outer unit. The inner unit is three-dimensionally rotatable on account of such a partially spherical surface and is translationally fixed on account of the equatorially symmetrical embodiment.
- In a further preferred embodiment, the outer unit has a contact surface corresponding to the partially spherical surface of the inner unit, at least in the region of a contact area. A corresponding contact surface is in particular a partially spherical recess, which corresponds substantially to the inverse of the partially spherical surface of the inner unit. In particular on account of an equatorially symmetrical embodiment of the corresponding contact surface, the inner unit is enclosed in part by the outer unit, wherein the inner unit is translationally fixed and flexibly rotatable relative to the outer unit.
- In a further advantageous embodiment, the partially spherical surface of the inner unit and/or the corresponding contact surface of the outer unit are coated, in particular with a coating having molybdenum. At least one of the surfaces is carburized, subsequently manganese-phosphated and coated with a lubricant varnish based on molybdenum disulfide. Alternatively, a molybdenum coating is applied by means of flame spraying to at least one of the surfaces, wherein the molybdenum coating has a very good adhesion on account of its metallurgical properties. The coating thickness of the molybdenum coating lies between 0.1 mm and 2.0 mm. Such a coating optimizes the friction behavior between the inner unit and the outer unit.
- Particularly advantageously, the inner unit is configured in at least two parts. On account of a two-part configuration, the drive axle can be mounted easily and quickly.
- In a further preferred embodiment, the loading device has wheel hub bearing means, via which a loading machine can be connected to the drive axle. The wheel hub bearing means comprise in particular at least one bearing unit, by way of which the drive axle is connected in a realistic manner to the loading device.
- Particularly advantageously, the wheel hub bearing means comprise a bearing unit for absorbing an axial force. The bearing unit is affixed in particular in an axially flexible manner to a wheel hub. Such a bearing unit enables a loading of the drive axle free from axial forces.
- In a further advantageous embodiment, the loading device has at least one hydraulic cylinder for loading the drive axle with an in particular dynamic additional force. The dynamic additional force is generated by raising and lowering the hydraulic cylinder and acts in particular radially on the drive axle. Such a dynamic additional force acting radially on the drive axle enables ground unevennesses, for example, to be reproduced on the test bench.
- Particularly advantageously, the loading device has push rods for transmitting an in particular dynamic additional force. The push rods make it possible to vary the force direction of the in particular dynamic additional force, thus enabling a realistic simulation of running characteristics and running situations.
- In one advantageous embodiment, the test bench has a part-turn drive for simulating an ascending gradient and/or a descending gradient. On account of the part-turn drive, running characteristics in various running situations can be simulated even more realistically.
- In a further advantageous embodiment, the test bench has means for vibrationally isolating the test bench from a foundation. On account of such a vibrational isolation of the test bench from the foundation, the result of the test of the drive axle is not distorted by external influences, for example by other test benches or other machines. Conversely, disturbances originating from the test bench are not transmitted to the foundation.
- The means for vibrationally isolating the test bench advantageously comprise spring elements. The use of spring elements enables the test bench to be isolated easily and cost-effectively from the foundation.
- The invention is described and explained in more detail below on the basis of the exemplary embodiments shown in the figures, in which:
-
FIG. 1 shows a three-dimensional representation of a test bench for a drive axle of a motor vehicle, -
FIG. 2 shows a sectional view of a test bench for a drive axle of a motor vehicle in the region of a receptacle device, -
FIG. 3 shows a three-dimensional section of a test bench for a drive axle of a motor vehicle in the region of a receptacle device, -
FIG. 4 shows a three-dimensional representation of an inner unit of a receptacle device, and -
FIG. 5 shows a cross-section of the receptacle device with the drive axle. - The same reference characters have the same meaning in the various figures.
-
FIG. 1 shows a three-dimensional representation of atest bench 2 for adrive axle 4 of a motor vehicle, wherein thedrive axle 4 is arranged for testing in areceptacle device 6. Thedrive axle 4 is received by thereceptacle device 6 on original suspension points in a translationally fixed and flexibly rotatable manner. Thedrive axle 4 thus has the same degrees of freedom in relation to an application of force and an application of torque as in the installed state in the vehicle. - The
drive axle 4 comprises an axle housing, an axle gear unit and at least one axle shaft. Thetest bench 2 comprises adrive device 8, which has adrive motor 10. Thedrive motor 10 is connected for example by way of a cardan shaft (not shown inFIG. 1 for reasons of clarity) to the axle gear unit of thedrive axle 4, which is embodied as a differential gear unit. On the output side, thedrive axle 4 is connected on both sides to aloading device 12, wherein theloading device 12 has aloading machine 14 on both sides. Theloading machines 14 are embodied for example as electric motors. Thedrive axle 4 can be loaded by theloading machines 14 both statically and dynamically, in particular in an oscillating manner, as well as differently on both sides. Thedrive axle 4 is driven on the drive side via thedrive motor 10 of thedrive device 8 and braked on the output side via theloading machines 14 of theloading device 12. - The
loading device 12 has bearingunits 16 arranged on both sides, which are mounted in an axially flexible manner on wheel hubs of thedrive axle 4. By absorbing axial forces, the bearingunits 16 enable the loading of thedrive axle 4 free from axial forces. - By the
drive axle 4 being received and loaded in such a way, the bending torques on all parts of the axle are reproduced in an optimal manner. Thetest bench 2 is used to test thedrive axle 4, taking real wheel loads into consideration. To minimize external influences, thetest bench 2 is vibrationally isolated from afoundation 22. The vibrational isolation of thetest bench 2 from the foundation is effected by means ofspring elements 22. -
FIG. 2 shows a sectional view of atest bench 2 for adrive axle 4 of a motor vehicle in the region of areceptacle device 6. The receiveddrive axle 4 is cooled by way of coolingpipes 25 with a coolant, for example air. The coolant, which is guided onto thedrive axle 4 by way of the coolingpipes 25, for example via nozzles, simulates in particular a headwind. - The
receptacle device 6 of thedrive axle 4 comprises on both sides of the axle drive unit in each case oneouter unit 18 for connection to thetest bench 2 and in each case oneinner unit 20 enclosed in part by theouter unit 18. Theinner unit 20 has a partiallyspherical surface 26, wherein theinner unit 20 rests on theouter unit 18 in the region of a bulge in the partiallyspherical surface 26. Theouter unit 18 has acontact surface 28 which corresponds to the partiallyspherical surface 26 of theinner unit 20 in the region of a contact area between theouter unit 18 and theinner unit 20. Theinner unit 20 is configured in two parts, wherein thedrive axle 4 is connected at least in a form-fit manner to theinner unit 20. On account of its partiallyspherical surface 26, theinner unit 20 is received in theouter unit 18 in a translationally fixed and flexibly rotatable manner. Furthermore, a part-turn drive 30 for simulating an ascending gradient and/or a descending gradient is affixed on each side of thereceptacle device 6 of thetest bench 2. - The
drive axle 4 can be loaded in a driven state by dynamic additional forces unrelated to driving and braking, which simulate for example ground unevennesses. The additional forces comprise in particular tractive forces, which occur for example during braking and acceleration of a motor vehicle, and bending torques, which occur for example when a motor vehicle travels around curves or when the motor vehicle is in a laterally tilted position. The additional forces are generated hydraulically by way ofhydraulic cylinders 32, which are arranged below the bearingunits 16. The bearingunits 16 are lubricated by means ofautomatic lubrication devices 33, which press a lubricant, in particular grease, via nozzles into the bearing units as required. At least one part of the additional forces is transmitted viapush rods 34. The further configuration of thetest bench 2 inFIG. 2 corresponds to the configuration shown inFIG. 1 . -
FIG. 3 shows a three-dimensional section of atest bench 2 for adrive axle 4 of a motor vehicle in the region of areceptacle device 6. The configuration of thetest bench 2 inFIG. 3 corresponds to the configuration shown inFIG. 2 . -
FIG. 4 shows a three-dimensional representation of aninner unit 20 of areceptacle device 6. Theinner unit 20 is manufactured from steel and has a partiallyspherical surface 26. The partiallyspherical surface 26 of the inner unit has the shape of a spherical segment symmetrical to anequator 39 and is therefore referred to as an equatorially symmetrical spherical segment. The round region of the spherical segment symmetrical to theequator 39 is provided as the contact surface for theouter unit 18 and is carburized, subsequently manganese-phosphated and coated with a lubricant varnish based on molybdenum disulfide in order to optimize the friction behavior. - Furthermore, the
inner unit 20 is configured in two parts, wherein thefirst part 36 and thesecond part 38 are fixed together by means of connecting elements such as pins, screws or bolts, or alternatively connected to one another in a detachable manner. Furthermore, theinner unit 20 comprises arecess 40 for receiving thedrive axle 4, wherein thedrive axle 4 is fastened by a connection of theparts inner unit 20. -
FIG. 5 shows a cross-section of thereceptacle device 6 with thedrive axle 4, wherein thedrive axle 4 is received via anadapter unit 42 in therecess 40 of theinner unit 20 shown inFIG. 4 . Theadapter unit 42 is connected to the original suspension points of thedrive axle 4 by way of connectingelements 44, in particular screws or bolts. Theinner unit 20, which is connected in a fixed manner to the drive axle, is received in theouter unit 18 in a translationally fixed and flexibly rotatable manner, wherein the coated, partiallyspherical surface 26 of theinner unit 20 is mounted movably on thecorresponding contact surface 28 of theouter unit 18. Thecorresponding contact surface 28 of theouter unit 18 is in particular also carburized, subsequently manganese-phosphated and coated with a lubricant varnish based on molybdenum disulfide in order to optimize the friction behavior. The further configuration of thereceptacle device 6 corresponds to the configuration shown inFIG. 2 . - In summary, the invention relates to a
receptacle device 6 for receiving adrive axle 4 of a motor vehicle for atest bench 2. In order to achieve a more realistic load distribution in comparison with the prior art, it is proposed that thereceptacle device 6 has at least oneouter unit 18 for connection to thetest bench 2 and at least oneinner unit 18 enclosed at least in part by theouter unit 18, wherein theinner unit 20 is translationally fixed relative to theouter unit 18 and is designed to be flexibly rotatable about at least one axis, and wherein theinner unit 20 has arecess 40 suitable for receiving thedrive axle 4.
Claims (23)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17183767.7A EP3435057A1 (en) | 2017-07-28 | 2017-07-28 | Mounting device for mounting a drive axle of a vehicle for a test bench |
EP17183767 | 2017-07-28 | ||
EP17183767.7 | 2017-07-28 | ||
PCT/EP2018/070127 WO2019020670A1 (en) | 2017-07-28 | 2018-07-25 | Receptacle device for receiving a drive axle of a motor vehicle for a test bench |
Publications (2)
Publication Number | Publication Date |
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US20200232879A1 true US20200232879A1 (en) | 2020-07-23 |
US11441972B2 US11441972B2 (en) | 2022-09-13 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/634,499 Active 2039-03-12 US11441972B2 (en) | 2017-07-28 | 2018-07-25 | Receptacle device for receiving a drive axle of a motor vehicle for a test bench |
Country Status (4)
Country | Link |
---|---|
US (1) | US11441972B2 (en) |
EP (2) | EP3435057A1 (en) |
CN (1) | CN111148983B (en) |
WO (1) | WO2019020670A1 (en) |
Cited By (2)
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CN113916686A (en) * | 2021-08-23 | 2022-01-11 | 浙江理工大学 | Ball hinge rigidity testing device and testing method for ball hinge rigidity |
US11761852B2 (en) * | 2021-10-28 | 2023-09-19 | Fca Us Llc | Rotary torque input fixture for testing a solid axle in a road simulation test |
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DE102021123875A1 (en) | 2021-09-15 | 2023-03-30 | Bayerische Motoren Werke Aktiengesellschaft | Arrangement for a steering gear test stand and steering gear test stand |
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-
2017
- 2017-07-28 EP EP17183767.7A patent/EP3435057A1/en not_active Withdrawn
-
2018
- 2018-07-25 WO PCT/EP2018/070127 patent/WO2019020670A1/en unknown
- 2018-07-25 EP EP18753073.8A patent/EP3642586B1/en active Active
- 2018-07-25 CN CN201880063517.1A patent/CN111148983B/en active Active
- 2018-07-25 US US16/634,499 patent/US11441972B2/en active Active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN113916686A (en) * | 2021-08-23 | 2022-01-11 | 浙江理工大学 | Ball hinge rigidity testing device and testing method for ball hinge rigidity |
US11761852B2 (en) * | 2021-10-28 | 2023-09-19 | Fca Us Llc | Rotary torque input fixture for testing a solid axle in a road simulation test |
Also Published As
Publication number | Publication date |
---|---|
CN111148983B (en) | 2022-07-08 |
EP3642586B1 (en) | 2021-08-25 |
EP3642586A1 (en) | 2020-04-29 |
US11441972B2 (en) | 2022-09-13 |
EP3435057A1 (en) | 2019-01-30 |
CN111148983A (en) | 2020-05-12 |
WO2019020670A1 (en) | 2019-01-31 |
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